package org.sanm.utils;


import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * 主要功能:网络请求
 *@author caijin
 */
public class HttpUtil {
    private static final int TIMEOUT_IN_MILLIONS = 5000;


    public interface CallBack {
        void onRequestComplete(String result);
    }


    /**
     *   异步的Get请求
     *   @param urlStr
     *   @param callBack
     */
    public static void doGetAsyn(final String urlStr, final CallBack callBack) {
        new Thread() {
            public void run() {
                try {
                    String result = doGet(urlStr);
                    if (callBack != null) {
                        callBack.onRequestComplete(result);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            };
        }.start();
    }



    public static  String doGet(String urlStr){
        return  doGet(urlStr, new HashMap<String, Object>(), new HashMap<String, String>());
    }

    public static  String doGet(String urlStr, Map<String, Object> params){
        return  doGet(urlStr, params, new HashMap<String, String>());
    }

    /**
     * Get请求，获得返回数
     * @param urlStr
     * @return
     * @throws Exception
     */
    public static String doGet(String urlStr, Map<String, Object> params, Map<String, String> headers) {
        URL url = null;
        HttpURLConnection conn = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        String paramsStr = "?";
        for (String key : params.keySet()) {
            paramsStr += key + "=" + params.get(key) + '&';
        }
        try {

            url = new URL(urlStr + paramsStr);
            conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
            conn.setRequestMethod("GET");
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            for (String key : headers.keySet()) {
                conn.setRequestProperty(key, headers.get(key));
            }
            if (conn.getResponseCode() == 200) {
                is = conn.getInputStream();
                baos = new ByteArrayOutputStream();
                int len = -1;
                byte[] buf = new byte[128];
                while ((len = is.read(buf)) != -1) {
                    baos.write(buf, 0, len);
                }
                baos.flush();
                return baos.toString();
            } else {
                throw new RuntimeException(" responseCode is  not 200 ... ");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {


                if (is != null)
                    is.close();
            } catch (IOException e) {


            }
            try {
                if (baos != null)
                    baos.close();
            } catch (IOException e) {


            }
            conn.disconnect();
        }
        return null;
    }

    public static String doPostForm(String url){
        return doPostForm(url, new HashMap<String, Object>(), new HashMap<String,String>());
    }

    public static String doPostForm(String url, Map<String, Object> params){
        return doPostForm(url, params, new HashMap<String,String>());
    }


    public static String doPostForm(String url, Map<String, Object> params, Map<String, String> headers) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url); // 打开和URL之间的连接
            HttpURLConnection conn = (HttpURLConnection) realUrl
                    .openConnection(); // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
            conn.setRequestProperty("charset", "utf-8");
            for (String key : headers.keySet()) {
                conn.setRequestProperty(key, headers.get(key));
            }
            conn.setUseCaches(false); // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
            String paramsStr = "";
            for (String key : params.keySet()) {
                paramsStr += key + "=" + params.get(key) + '&';
            }
            if (!paramsStr.trim().equals("")) { // 获取URLConnection对象对应的输出流
                out = new PrintWriter(conn.getOutputStream()); // 发送请求参数
                out.print(paramsStr);
                // flush输出流的缓冲
                out.flush();
            }
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 使用finally块来关闭输出流和输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

    public static String doPostJson(String url){
        return doPostJson(url, new HashMap<String, Object>(), new HashMap<String, String>());
    }

    public static String doPostJson(String url, Map<String, Object> params){
        return doPostJson(url, params, new HashMap<String, String>());
    }


    public static String doPostJson(String url, Map<String, Object> params, Map<String, String> headers) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url); // 打开和URL之间的连接
            HttpURLConnection conn = (HttpURLConnection) realUrl
                    .openConnection(); // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type","application/json");
            conn.setRequestProperty("charset", "utf-8");
            for (String key : headers.keySet()) {
                conn.setRequestProperty(key, headers.get(key));
            }
            conn.setUseCaches(false); // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

            ObjectMapper mapper = new ObjectMapper();
            String paramsStr = mapper.writeValueAsString(params);

            if (!paramsStr.trim().equals("")) { // 获取URLConnection对象对应的输出流
                out = new PrintWriter(conn.getOutputStream()); // 发送请求参数
                out.print(paramsStr);
                // flush输出流的缓冲
                out.flush();
            }
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 使用finally块来关闭输出流和输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

}

